Borges Gilberto Antonio, de Goes Mario Fernando, Platt Jeffrey A, Moore Keith, de Menezes Fernando Hueb, Vedovato Euripedes
Dental Materials and Restorative Dentistry, University of Uberaba, Brazil.
J Prosthet Dent. 2007 Sep;98(3):208-15. doi: 10.1016/S0022-3913(07)60057-2.
Surface treatment is an essential step in bonding a ceramic to resin. Alumina ceramics are particularly difficult to prepare for adequate bonding to composite resin cements.
The purpose of this study was to evaluate the bond strength between a densely sintered alumina ceramic and bovine dentin with 2 adhesive resin cements and a resin-modified glass ionomer cement using an extrusion shear strength test.
Alumina cones (n=30), 4 mm in height, 3 mm in diameter at the small end, and with an 8-degree taper, were fabricated. Without any treatment, the cones were cemented in a standardized cavity in 2.5-mm-thick bovine dentin discs using 1 of 3 cement systems: Panavia F, RelyX ARC, or RelyX Luting. The cements were manipulated following the manufacturers' instructions. After 24 hours of storage at 37 degrees C, an extrusion shear test was performed in a universal testing machine at 0.5 mm/min until bonding failure. The data were analyzed using 1-way ANOVA and Tukey HSD test (alpha=.05). All fractured specimens were examined at x25 magnification and classified by fracture mode. Representative specimens were selected for SEM observation.
The highest strength values were obtained with Panavia F, and they were significantly higher (P<.05) than each of the other 2 cements, which were not significantly different from each other. Panavia F resulted in predominantly mixed failure and RelyX ARC and RelyX Vitremer showed primarily adhesive failure.
An MDP-containing adhesive system (Panavia F) provides better extrusion bond strength to a high-density alumina ceramic than a Bis-GMA resin luting agent system (RelyX ARC) or a resin-modified glass ionomer cement system (RelyX Luting).
表面处理是将陶瓷与树脂粘结的关键步骤。氧化铝陶瓷尤其难以制备以实现与复合树脂水门汀的充分粘结。
本研究的目的是使用挤压剪切强度试验评估致密烧结氧化铝陶瓷与牛牙本质之间用两种粘结性树脂水门汀和一种树脂改性玻璃离子水门汀的粘结强度。
制作高度为4mm、小端直径为3mm且锥度为8度的氧化铝圆锥体（n = 30）。未经任何处理，使用三种水门汀系统之一：Panavia F、RelyX ARC或RelyX Luting，将圆锥体粘结在2.5mm厚的牛牙本质圆盘的标准化窝洞中。按照制造商的说明操作水门汀。在37℃储存24小时后，在万能试验机上以0.5mm/min的速度进行挤压剪切试验，直至粘结失败。使用单因素方差分析和Tukey HSD检验（α = 0.05）分析数据。所有断裂标本在25倍放大率下检查并按断裂模式分类。选择代表性标本进行扫描电子显微镜观察。
Panavia F获得了最高强度值，且显著高于其他两种水门汀（P < 0.05），而后两种水门汀之间无显著差异。Panavia F主要导致混合性失败，RelyX ARC和RelyX Vitremer主要表现为粘结性失败。
含MDP的粘结系统（Panavia F）比双酚A缩水甘油醚树脂粘结剂系统（RelyX ARC）或树脂改性玻璃离子水门汀系统（RelyX Luting）为高密度氧化铝陶瓷提供更好的挤压粘结强度。
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